04-14-12, 11:58 PM #21
Sorry if I am not making myself clearer.
If the surface 'wrinkles', the surface may stay the same 'area' but its ridges effectively make the 'fitting space' smaller diameter without the actual inner surface area changing much.
Then I also said that the inner diameter may not change because the inner surface layers may be 'compressed' and made a denser layer than the material behind it.
That's all I meant mate. Cheers!
Disclaimer Again: I do not know about the 'heating fit' side of things. I've only ever used (once) the 'cooling' method for the stud/bolt to go into such a hole.
04-15-12, 12:18 AM #22
I've said many times that I can find a video for any occasion. If you watch the following video you will know the answer and there won't be any doubts.
select the second video Conceptual physics Ball & Ring expansion
04-15-12, 09:05 AM #23
See my Post #8, where I suggested consideration of the circumference of both the inner & outer circles.
Isn't obvious that both circumferences expand as the washer is heated? If you think of the washer as made up of a large number of very thin rings, each ring would expand along the circumference.
If the inner circumference increases, the radius must increase.
I would expect the washer to get thicker (Id est: Difference between radii increases) with some expansion toward the center. I expect that expansion to be overwhelmed by the increase in circumference.
04-15-12, 10:12 AM #24
04-16-12, 04:07 PM #25
...so if the washer was cut through on one side and the newly-cut edges were allowed to cross over (like a ribbon) then we could expect a shrinking hole?
04-16-12, 08:01 PM #26
04-16-12, 08:52 PM #27keith1Guest
The material becomes molten before it expands by 1%?
The material puddles?
The hole decreases in the puddle?
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